139
FNCA52 TJSJ 130730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST THU AUG 13 2026
DISCUSSION
FIRE WEATHER CONCERNS WILL INCREASE TODAY THROUGH SATURDAY AS A
MUCH DRIER AIR MASS COMBINES WITH STRENGTHENING EASTERLY WINDS.
RECENT RAINFALL MAY INITIALLY PROVIDE SOME MITIGATION, BUT
CONTINUED DRY210ING OF FINE FUELS IS EXPECTED, PARTICULARLY
ACROSS THE SOUTHERN AND SOUTHWESTERN COASTAL PLAIN OF PUERTO
RICO. ELEVATED FIRE DANGER IS EXPECTED TODAY, WITH CONCERNS
INCREASING FRIDAY AND SATURDAY AS DRY AND BREEZY TO LOCALLY WINDY
CONDITIONS PERSIST. MOISTURE WILL BEGIN INCREASING LATE SATURDAY
NIGHT, EVENTUALLY REDUCING FIRE WEATHER CONCERNS. REFER TO THE
LATEST FIRE DANGER STATEMENT (RFDSJU) FOR ADDITIONAL DETAILS.
PRZ014-132000-
SOUTHEAST COASTAL PLAINS-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 10
TEMP (24H TREND) 92 (+3) 76 (-1) 93
RH % (24H TREND) 47 (-19) 84 (-8) 40
WIND 20FT/EARLY(MPH) E 17 G25 E 14 E 19 G30
WIND 20FT/LATE(MPH) E 21 G32 E 13 E 19 G29
MIXING HGT(FT-AGL/MSL)4580 5030
TRANSPORT WND (MPH) E 25 E 29
VENT RATE (KT-FT) 100760 125750
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-132000-
SOUTHERN HILLS-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 89 (+4) 72 (-3) 92
RH % (24H TREND) 50 (-21) 92 (-4) 44
WIND 20FT/EARLY(MPH) E 16 E 16 E 18
WIND 20FT/LATE(MPH) E 19 E 16 E 17
MIXING HGT(FT-AGL/MSL)4940 5470
TRANSPORT WND (MPH) E 25 E 28
VENT RATE (KT-FT) 108680 131280
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-132000-
NORTH COASTAL PLAINS-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 10
TEMP (24H TREND) 92 (+3) 76 (-1) 93
RH % (24H TREND) 53 (-18) 93 (-4) 51
WIND 20FT/EARLY(MPH) E 17 E 17 E 17
WIND 20FT/LATE(MPH) E 19 E 16 E 24
MIXING HGT(FT-AGL/MSL)5350 5370
TRANSPORT WND (MPH) E 23 E 26
VENT RATE (KT-FT) 107000 123510
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-132000-
NORTHERN HILLS-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 10
TEMP (24H TREND) 91 (+3) 73 (-1) 91
RH % (24H TREND) 51 (-19) 93 (-7) 50
WIND 20FT/EARLY(MPH) E 14 E 16 E 17
WIND 20FT/LATE(MPH) E 18 E 11 E 20
MIXING HGT(FT-AGL/MSL)5920 5940
TRANSPORT WND (MPH) SE 21 E 23
VENT RATE (KT-FT) 106560 118800
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-132000-
WEST COAST-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 20
TEMP (24H TREND) 93 (+2) 75 (-1) 93
RH % (24H TREND) 50 (-18) 92 (-5) 47
WIND 20FT/EARLY(MPH) E 18 E 18 E 17
WIND 20FT/LATE(MPH) SE 19 E 12 E 18
MIXING HGT(FT-AGL/MSL)5100 5240
TRANSPORT WND (MPH) E 21 E 17
VENT RATE (KT-FT) 91800 78600
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-132000-
EASTERN INTERIOR-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 20
TEMP (24H TREND) 90 (+3) 74 (-2) 91
RH % (24H TREND) 54 (-16) 92 (-5) 49
WIND 20FT/EARLY(MPH) E 18 E 17 E 18
WIND 20FT/LATE(MPH) E 19 E 17 E 16
MIXING HGT(FT-AGL/MSL)4920 5310
TRANSPORT WND (MPH) E 24 E 26
VENT RATE (KT-FT) 103320 122130
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-132000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 20
TEMP (24H TREND) 85 (+4) 72 (-2) 87
RH % (24H TREND) 60 (-21) 96 (-3) 57
WIND 20FT/EARLY(MPH) E 16 E 14 E 14
WIND 20FT/LATE(MPH) E 19 E 14 E 13
MIXING HGT(FT-AGL/MSL)4460 5070
TRANSPORT WND (MPH) E 24 E 28
VENT RATE (KT-FT) 93660 121680
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-132000-
CENTRAL MOUNTAIN RANGE-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 0 0 10
TEMP (24H TREND) 88 (+5) 69 (-3) 90
RH % (24H TREND) 52 (-24) 96 (-3) 48
WIND 20FT/EARLY(MPH) E 12 E 11 E 13
WIND 20FT/LATE(MPH) E 16 E 9 E 16
MIXING HGT(FT-AGL/MSL)5930 6890
TRANSPORT WND (MPH) E 22 E 21
VENT RATE (KT-FT) 112670 124020
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-132000-
CAYEY MOUNTAIN RANGE-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 20
TEMP (24H TREND) 85 (+3) 72 (-2) 87
RH % (24H TREND) 61 (-17) 95 (-5) 54
WIND 20FT/EARLY(MPH) E 14 E 13 E 16
WIND 20FT/LATE(MPH) E 19 E 13 E 16
MIXING HGT(FT-AGL/MSL)4670 4950
TRANSPORT WND (MPH) E 25 E 31
VENT RATE (KT-FT) 102740 133650
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-132000-
VIEQUES-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 91 (+2) 80 (0) 91
RH % (24H TREND) 58 (-7) 83 (-5) 54
WIND 20FT/EARLY(MPH) E 21 E 20 E 21
WIND 20FT/LATE(MPH) E 20 E 20 E 16
MIXING HGT(FT-AGL/MSL)4050 4150
TRANSPORT WND (MPH) E 26 E 30
VENT RATE (KT-FT) 93150 107900
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-132000-
CULEBRA-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 91 (+3) 80 (-1) 92
RH % (24H TREND) 61 (-10) 86 (-4) 58
WIND 20FT/EARLY(MPH) E 21 E 20 E 21
WIND 20FT/LATE(MPH) E 20 E 20 E 17
MIXING HGT(FT-AGL/MSL)4000 4200
TRANSPORT WND (MPH) E 26 E 29
VENT RATE (KT-FT) 92000 105000
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-132000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 93 (+3) 76 (-1) 93
RH % (24H TREND) 48 (-16) 87 (-6) 43
WIND 20FT/EARLY(MPH) E 21 G31 E 20 G29 E 20 G30
WIND 20FT/LATE(MPH) E 21 G32 E 16 E 23 G31
MIXING HGT(FT-AGL/MSL)4730 5100
TRANSPORT WND (MPH) E 28 E 26
VENT RATE (KT-FT) 113520 117300
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-132000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 10
TEMP (24H TREND) 90 (+4) 79 (-1) 90
RH % (24H TREND) 62 (-9) 87 (-2) 58
WIND 20FT/EARLY(MPH) E 23 E 21 E 21
WIND 20FT/LATE(MPH) E 21 E 21 E 18
MIXING HGT(FT-AGL/MSL)3720 4090
TRANSPORT WND (MPH) E 26 E 31
VENT RATE (KT-FT) 85560 110430
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-132000-
ST CROIX-
330 AM AST THU AUG 13 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 90 (+3) 80 (0) 90
RH % (24H TREND) 61 (-10) 85 (-7) 57
WIND 20FT/EARLY(MPH) E 23 E 20 E 21
WIND 20FT/LATE(MPH) E 21 E 21 E 17
MIXING HGT(FT-AGL/MSL)4310 4890
TRANSPORT WND (MPH) E 29 E 31
VENT RATE (KT-FT) 107750 132030
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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